JPH0234099B2 - JIKIKIROKUSAISEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus in which a magnetic tape runs and performs recording and reproducing.

Prior Art In general, recording and reproducing devices using magnetic tape,
For example, in a VTR, when the tape starts running around a guide drum with a magnetic head, while the tape is running,
It is also desirable to control the tape tension so that it is always constant when the tape stops running. In conventional magnetic recording and reproducing devices, in normal recording and reproducing mode and in high-speed/low-speed reproducing mode (special reproduction mode), the magnetic tape is held and driven by a capstan and a pinch roller, and the tape is stopped by stopping the capstan. In the fast forward and rewind modes in which the magnetic tape is stopped and the tape running speed is high, the magnetic tape runs at high speed by rotating the reel disk, and the reel disk is stopped by braking to stop the tape running. Therefore, in the recording/playback mode, it is possible to control the tape tension so that it does not change as much as possible, including the transient state at the start and stop of running, but in the fast forward and rewind modes, the tape tension fluctuates even while the tape is running. This causes problems in that the tape winding state becomes unstable, and especially in transient states when the tape starts and stops running, the tape tension fluctuates greatly and reaches an abnormal value, damaging the tape.

Means for Solving the Problems The present invention solves the above-mentioned problems and provides fast forward and rewind modes in which the magnetic tape is along a predetermined tape path and the drum is rotating. a pinch roller crimping means that keeps the pinch roller pressed against the capstan in all modes including the pinch roller; A capstan control means is configured to switch and control the vehicle to travel in a predetermined direction at a speed corresponding to each mode while being clamped and driven by the capstan, and to control the rotation to be stopped by operating the stop mode.

Embodiment An embodiment will be described below with reference to the drawings.

Figures 1 and 2 show a state in which the tape loading of the magnetic recording/reproducing device (3/4-inch stationary VCR) 1 according to the present invention has been completed, and a state in which the tape loading operation is in progress after the tape has been pulled out by the loading arm. Indicates the condition. Further, FIG. 6 is a diagram schematically showing the tape loading operation state of the magnetic recording/reproducing apparatus according to the present invention. This recording/reproducing apparatus 1 is in a stop mode when the magnetic tape is pulled out from the cassette and loaded in a predetermined path as shown in FIG. It is configured to perform the following operations.

In each figure, 2 is a 3/4 inch video tape cassette,
3 is a supply side reel disk, 4 is a take-up side reel disk, 5 is a supply side loading arm, 6 is a take-up side loading arm, 7 is a loading ring, 8 is a guide drum having a video head, 9
1 is a capstan, 10 is a pinch roller, 11 is an erase address head, and 12 is an audio control head.

When the cassette is not installed, the loading arms 5 and 6 are rotating counterclockwise and clockwise, respectively, and the loading poles 13 and 14 are in the second position, respectively.
It is located at the position indicated by the two-dot chain line in the figure and at the position shown in FIG. 6A. Further, the loading ring 7 is rotating counterclockwise, and the pinch roller 10 is at the position shown in FIG. 2, and is at a position lower than the tape 26.

When the cassette 2 is loaded, the cassette loading detection micro switch 15 operates to detect the loading of the cassette, and the device 1 automatically starts operating after a slight delay, and the video head inside the drum 8 rotates. As a first step, the tape is pulled out to the state shown in FIGS. 2 and 6B, and then, as a second step, the tape is guided to the state shown in FIGS. 1 and 6D.

At the beginning of the tape draw-out operation, the reel-disk system is controlled as described below. First, a predetermined voltage is applied to the supply side reel motor 16 and the take-up side reel motor 17 to which each reel disk 3, 4 is directly connected, and approximately the same tape winding torque (arrow C) is applied to each reel disk 3, 4. direction) is given. Next, the supply side brake solenoid 18 and the take-up side brake solenoid 19 are activated simultaneously, and the brake arms 20 and 21 are rotated clockwise to loosen the brake bands 22 and 23, and the supply side and take-up side reel disks 4, 5 is released. As a result, each reel disk 3, 4 is released from braking, and the same tape winding torque is applied to each reel disk 3, 4.

Next, the supply side loading arm 5 and the take-up side loading arm 6 are rotated clockwise and counterclockwise about the shafts 24 and 25, respectively, to the final positions shown in FIGS. 1 and 2. The magnetic tape 26 is held by the loading poles 13 and 14 and pulled out from the cassette 2, forming a tape path 27A partially attached to the guide drum 8 as shown in FIG. 2, and the tape pulling operation is completed.

Here, since the same winding torque is applied to each reel disk 3, 4, the tape 26 is placed on the reel with smaller tape pull-out resistance, that is, depending on the state of tape winding in the cassette 2. The tape is pulled out mainly from the reel side with the larger tape winding diameter. The magnetic tape 26 has a transparent leader tape connected to its starting end and a transparent trailer tape (both not shown) connected to its terminal end, with the leader tape connected to a take-up reel and the trailer tape connected to a supply reel. It has been done.

When the tape pull-out operation is completed and the tape path 27A is formed, the tape detection means consisting of the lamp 28, the supply side phototransistor 29, and the take-up side phototransistor 30 operates, and detects the presence or absence of the magnetic tape, the leader tape, and the like. Information on trailer tape detection is sent to a mechanism control circuit (not shown), and the operation of the apparatus 1 is thereafter controlled by this control circuit. When a trailer tape is detected, the reel motors 16 and 17 are controlled in the same way as in the rewind mode, and when a leader tape is detected, they are controlled in the same way as in the fast forward mode, and when a trailer tape is detected. The rewind operation is performed until the leader tape is no longer detected, and the fast forward operation is performed until the leader tape is no longer detected, and the apparatus 1 subsequently shifts to the next mode. Note that if the trailer tape and leader tape are still detected even after performing this rewinding or fast forwarding operation for a predetermined period of time, it is determined that no tape exists, and the device 1 enters the store mode and loads each loading arm. 5 and 6 rotate in the opposite direction to the above. Further, if the magnetic tape 26 is detected from the beginning instead of the trailer tape or leader tape, the mode immediately shifts to the next mode.

That is, at the time when the tape drawing operation is completed, the state of the tape is checked, appropriate correction is made as necessary, and the apparatus 1 starts the second stage of the tape feeding operation.

During the tape feeding operation, the supply side brake solenoid 18 is first demagnetized and the reel disk 3
is braked, and at the same time, power to the supply reel motor 16 is cut off. Further, the differential transformer 31 detects the position of the take-up tension arm 32, and the voltage applied to the take-up reel motor 17 is controlled so that the arm 32 is at a predetermined rotational position.

Here, the configuration and operation of the winding-side tension arm 32 and the differential transformer 31 will be explained with reference to FIG. 3 as well. The take-up side tension arm 32 is pivotally supported by a pin 33, has a tape guide roller 34 at its tip, and is rotated clockwise by a compression coil spring 35, that is, in a direction that increases the length of the tape path 27A, and in a differential direction. Detection rod 3 of transformer 31
It is biased in the direction away from 6. The tensions T ₁ and T ₂ of the magnetic tape 26 act on the tape guide roller 34 as a resultant force F ₁ , and the tension arm 32
takes a position where the counterclockwise rotation torque due to the force F ₁ and the clockwise rotation torque due to the force F ₂ of the spring 35 are balanced. Therefore, the differential transformer 31
The tape tensions T ₁ and T ₂ at the tape guide roller 34 are controlled to predetermined values by controlling the voltage applied to the take-up reel motor 17 according to the position signal of the tension arm 32 obtained from the above. becomes possible.

In this way, with the supply side reel disk 3 being braked and tape tension control possible on the take-up side, the loading motor 39 is started and the loading ring 7 is driven by the drive gear 40 to move clockwise. Rotate to. A pinch roller arm 41 is pivotally supported on the loading ring 7 by a pin 42, and a return roller 43 and a pinch roller 10 are provided on this arm 41. By rotating the ring 7, the tape path 27A is
The magnetic tape 26 forming the magnetic tape 26 is stopped by the return roller 43, is drawn around the drum 8, and attached to the periphery of the drum 8. Further, during the rotation of the ring 7, the first and second arms 44, 45 rotate, and the movable guide poles 46, 47 rise to guide the tape. When the ring 7 rotates approximately once, the pin 48 on the ring pushes one arm of the L-shaped loading end detection arm 49, and the detection arm 49 moves counterclockwise to the other arm, as shown in FIG. The pin 50 rotates to a position where it engages one corner of the hexagonal hole 52 of the micro switch mounting base 51, and the unloading end micro switch 53 is turned off and the loading end micro switch 54 is turned off.
turns on.

When the micro switch 54 is turned on, the loading motor 39 having an internal clutch stops after a short delay. In addition, the pinch roller crimping solenoid 55 is energized and performs a suction operation, and the crimping arm 56 rotates clockwise via the spring to lock and press the pinch roller shaft 57 through the V-shaped groove, and the pinch roller 10 is moved to the capstan. Crimp to 9. In this state, the capstan motor 58 remains stopped, and although the tape 26 is held between the capstan 9 and the pinch roller 10, it stops without running. The device 1 is in the basic stop mode in this state.

During the above-mentioned tape feeding operation, the return roller 43 is at the position indicated by the two-dot chain line in FIG.
Until the tape 26 reaches the position shown in , the tension is kept constant by the tension arm 32, the differential transformer 31, and the take-up reel motor 17, and the tape 26 is pulled out only from the take-up reel.
The attachment to the peripheral surface of the drum 8 is almost completed. In general, mistakes are likely to occur in the tape loading operation, especially in the operation of adhering the tape along a predetermined travel path on the circumferential surface of the drum, and stability in this operation section is required. In this embodiment, considering that the tape attached to the drum 8 is a tape drawn out from the supply reel, the supply reel disk 3 is braked so that the magnetic tape 26 stops without running. The tape 26 is attached to the guide drum 8, and the tape 26 is attached accurately and stably along a predetermined running path on the circumferential surface of the guide drum 8.

When the tape feeding operation progresses to the above stage, the second arm 45 rotates and the micro switch 59 is turned on, and in response, the supply side brake solenoid 18 is energized and the braking of the reel disk 3 is released. On the supply side, similarly to the take-up side, the differential transformer 60 detects the rotating position of the supply side loading arm 5 and controls the reel motor 16.
voltage is controlled. As a result, the subsequent tape feeding operation is performed by pulling out the magnetic tape 26 from both the take-up reel and the supply reel while controlling the tape tension at a constant level, and the tape feeding operation is completed. At this point, the tape tension within the tape path is in a controlled state similar to when the tape is running, which will be described later.

When the tape feeding operation is completed, the tape 26 is pulled out of the cassette 2 from the supply reel as shown in FIG. 1, attached to the erase/address head 11, guided to the loading pole 13, and guided It spirally attaches to the circumferential surface of the guide drum 8 over a predetermined angular range regulated by the poles 61 and 62, further attaches to the audio control head 12, passes between the capstan 9 and the pinch roller 10, Movable guide poles 47 and 46 whose direction has been reversed by the return roller 43 and are standing on the opposite side of the pinch roller 10;
Guided by the loading pole 14 and tape guide roller 34, the tape enters the cassette 2 again and forms a tape path 27B leading to the take-up reel. Further, each reel motor 16 and 17 is maintained in a state where the above-mentioned voltage is applied to each reel motor 16 and 17, respectively.

When a normal recording/reproducing operation is performed here, the capstan motor 58 starts and the capstan 9 rotates in the clockwise direction shown by the arrow, and the tape 26 is held and driven by the capstan 9 and the pinch roller 10 and rotates in the forward direction. Run. At this time, the tape 26 is pulled out while the tape tension at section A is controlled by the supply reel motor 16, a video signal is recorded or reproduced by the video head at the guide drum 8, and the tape 26 is pulled out by the take-up reel motor 17. The tape tension in section B is controlled and the tape is wound onto a take-up reel.

Also, during reverse playback, the capstan motor 58 rotates in reverse, or during special playback mode from 1/30x to 5x speed, the capstan motor 58 rotates at a speed corresponding to the mode, and the tape 26 is rotated in the reverse direction. Similarly, the tape runs while the tape tensions at sections A and B are controlled to be constant.

When a stop operation is performed in each of the above modes, a reverse brake is applied to the capstan motor 58 to stop the rotation of the capstan 9, and the magnetic tape 26 is stopped.
The tape remains pressed by the pinch roller 10 and the capstan 9, and the tape tensions on the supply side and take-up side are kept constant and stopped. Also, during each of the above modes, the phototransistor 29,
When the trailer tape and leader tape are detected by
Tape running is stopped only by applying a reverse brake to the capstan motor 58 without applying brakes to the reel disks 3 and 4.

Further, a frequency generator 63 is provided below the capstan motor 58. The tape running length in each of the above modes is displayed as real time in minutes and seconds by appropriately processing and counting the output pulse signal from the frequency generator 63. Note that there is a slight slip between the capstan 9 and the tape 26, and the number of rotations of the capstan 9 does not completely correspond to the running length of the tape 26, but this deviation is extremely small and actually The above problem does not occur.

When a fast forward or rewind operation is performed, the capstan motor 58 rotates clockwise or counterclockwise at high speed, and the tape 26 is held between the capstan 9 and the pinch roller 10 at high speed, and the reel motors 16 and 17 The tape runs along the tape path shown in FIG. 1 while the tension at positions A and B is controlled by the tape. Note that the capstan motor 58 performs a slow start so that the amount of slip between the tape and the capstan does not increase and the tension does not rise to an excessive value, even temporarily, especially at the start of tape running. If a stop operation is performed during the fast forward or rewind mode, the capstan motor 58 applies a reverse brake to stop the tape running, as in the case described above. Also in this fast-forward and rewind mode, the amount of tape travel is displayed in real time using the output of the frequency generator 63, as in the case described above.

Here, when a trailer tape is detected in the fast forward mode and a leader tape is detected in the rewind mode, unlike the above case, in addition to stopping the capstan motor 58 by braking, the solenoid 18,
19 is demagnetized, each reel disk 3, 4 is braked, and at the same time, the solenoid 55 is demagnetized so that the pinch roller 10 is separated from the capstan 9. As a result, the reel disks 3 and 4 are braked while the tape 26 is released from being held between the capstan 9 and the pinch roller 10, so that the trailer tape and the leader tape can be transferred to the guide drum in an extremely short time. Stop at a position sufficiently before reaching the circumferential surface. Here, pinch roller 1
If the tape 0 is left crimped to the capstan 9, excessive tension will be applied to the tape because the capstan 9 will stop rotating somewhat later than the reel disks 3 and 4 stop rotating. In this embodiment, since the pinch roller 10 is separated from the capstan 9, the feeding of the tape 26 by the capstan 9 is immediately stopped (released), and the time delay in stopping the capstan 9 has no effect, and the tape 26 is moved away from the capstan 9 due to excessive tape tension. stop without applying any pressure.

After that, the device 1 performs a tape position correction operation. That is, the braking of each reel disk 3, 4 is released, the pinch roller 10 is pressed against the capstan 9 again, and the capstan motor 58 rotates counterclockwise in the trailer tape detection state and clockwise in the leader tape detection state. . As a result, the tape 26 is run in the direction in which the detected trailer tape or leader tape returns into the cassette.
When the tape runs and the trailer tape and leader tape are no longer detected by the phototransistors 29 and 30, the capstan motor 58 is stopped by applying a reverse brake. Note that the counting operation of the output pulse signal of the frequency generator 63 is stopped immediately when the leader tape or trailer tape is detected, the real time display is maintained in the state at that point, and the tape position correction operation stops the counting operation of the output pulse signal of the leader tape or trailer tape. Resumes when tape is no longer detected.

In addition, the tension arm 32 and the supply side loading arm 5 slightly change their rotational positions depending on the running direction of the tape, and change the voltages applied to the reel motors 17 and 16, thereby applying the voltage to the tape 26 at the A and B positions. The optimum tension is applied depending on the tape running direction.

Furthermore, if the stop mode continues for a certain period of time or more, or if the stop button is pressed twice, the rotation of the magnetic head inside the guide drum 8 will stop, the pinch roller 10 will be separated from the capstan 9, and both reel motors 16, 17 will be moved. energization is stopped, and both reel discs 3 and 4 are braked. This prevents deformation of the pinch roller 10 and wear of the magnetic head.

Also, when the eject operation is performed, pinch roller 1
0 is separated from the capstan 9, the supply side reel disk 3 is braked, and in this state, the loading ring 7 is driven by the motor 39 and rotates in the opposite direction to that during the tape feeding operation, that is, counterclockwise. move. Magnetic tape 26 being pulled around
is wound onto the take-up reel without loosening while the tension is controlled to be constant by the take-up tension arm 32. When the loading ring 7 rotates to its original position, the detection arm 49 is pushed by the pin 48 and rotates clockwise, the unloading end micro switch 53 is turned on, and the loading motor 39 is stopped.
As a result, the ring 7 returns to its original position, and the tape path becomes the tape path 27A shown in FIG.

Subsequently, the device 1 shifts to tape store mode. The supply side brake solenoid 18 is energized again, and the brake on the supply side reel disk 3 is released. As a result, both the reel disks 3 and 4 on the supply side and the take-up side are in a state in which the braking is released and approximately the same tape winding torque is applied by each reel motor 16, 17, that is, during the tape drawing operation described above. will be in the same state. In this state, the take-up side loading arm 6 rotates clockwise, and the supply side loading arm 5 subsequently rotates counterclockwise to the original position, and the tape 26 is attached to one or both reels without loosening. It is wound up and stored in the cassette 2.

Next, a control system for the capstan motor 58, which is a main part of the present invention, will be explained with reference to FIG. 4.

In the normal recording/reproducing mode, the capstan motor 58 receives the output signal from the phase comparator 70 and the F
The output signal from the -V converter 71 is mixed and amplified by a mixing amplifier 72, and a signal is added via a motor drive amplifier 73 to rotate at a normal speed. In the fast forward or rewind mode, a signal is output from the fast forward/rewind mode setting circuit 74, and this signal turns off the switches SW ₁ and SW ₂ and turns on the switch SW ₃ . This results in
The fast forward/rewind speed voltage of terminal 75 is switched.
SW ₃ is applied to the motor 58 via amplifiers 72 and 73, and the motor 58 rotates at high speed. The pinch roller 10 remains pressed against the capstan 9 not only when the motor 58 is rotating at a normal speed but also when the motor 58 is rotating at a high speed.
Capstan 9 is also used in fast forward and rewind modes.
and the pinch rollers 10, and the rollers are pinched and driven to travel. When a stop operation is performed in each of the above modes, a braking signal is supplied to the motor control circuit 77 through the terminal 76, which operates to brake the rotation of the motor 58 and stop it.

Incidentally, when a trailer tape or a leader tape is detected during the fast forward or rewind mode, the capstan motor 58 is braked and stopped by the braking circuit 77, and each solenoid is demagnetized as shown in FIG. The figure shows the solenoid drive system. When the magnetic tape 26 is present opposite each phototransistor 29, 30, each phototransistor 29, 30 does not receive light from the lamp 28 and is both off, and voltage +Vc is applied to the control circuit 78. The output signal from this circuit 78 operates the solenoid drive circuits 79, 80, and 81, and the solenoids 18, 19, and 55 are all energized. As a result, the apparatus 1 is in a state in which the brakes on the respective reel disks 3 and 4 are released and the pinch roller 10 is pressed against the capstan 9.

In the fast forward mode, when the trailer tape is pulled out to a position opposite to the phototransistor 29, the phototransistor 29 receives the light from the lamp 28 that has passed through the trailer tape and turns on, and the voltage application to the control circuit 78 is interrupted. Then, each of the drive circuits 79 to 81 becomes inactive, and the solenoids 18, 19, and 55 are all demagnetized. When the solenoids 18 and 19 are demagnetized, the reel disc 3,
4 is braked and the solenoid 55 is demagnetized, the pinch roller 10 is separated from the capstan 9. As a result, the forward high-speed running of the tape 26 is stopped instantaneously as the rotation of the reel disks 3 and 4 is stopped by braking, and the pinching drive of the tape between the pinch roller 10 and the capstan 9 is released. Note that the same operation as described above also occurs when the leader tape is detected by the phototransistor 30 in the rewind mode.

Effects As described above, according to the magnetic recording and reproducing apparatus of the present invention, the magnetic tape is along a predetermined tape path and the tape is moved by the pinch roller in all modes including the fast forward and rewind modes in which the drum is rotating. The tape is gripped and driven by a capstan and a capstan, and the capstan stops rotating to stop the tape from running, so it can be used not only when the tape is running at normal speed, but also when the tape is running at high speed. Also, it is possible to minimize fluctuations in tape tension even during transitions between the start and stop of high-speed tape running, and to stabilize tape running from the start of tape running until it stops in all modes. In connection with this, it is possible to stably wind the tape on the reel without causing step winding or waving in fast forward and rewind modes, and it is also possible to detect the beginning or end of the tape while the tape is running at high speed. When this occurs, the reel disk is braked to a stop and the pinch roller is separated from the capstan to release the tape clamping drive, so the tape running at high speed can be moved to the position where the leader tape or trailer tape attaches to the guide drum. It is possible to quickly stop the magnetic tape before it is pulled out, and it is possible to avoid the joint between the magnetic tape and the leader tape or trailer tape from having an adverse effect on the rotating video head. By releasing the clamping drive, it is possible to protect the tape by eliminating adverse effects such as an increase in tape tension that may occur due to a time lag when the reel disk and capstan complete their stops.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the state of an embodiment of the magnetic recording/reproducing apparatus according to the present invention in a stop mode after the tape draw-out and feeding operations are completed, and FIG. FIG. 3 is a plan view showing the state of the take-up side tension arm mechanism in FIGS. 1 and 2, and FIG.
The figure is a block diagram of one embodiment of the capstan motor control system, Figure 5 is a block diagram showing the relationship between the leader tape and trailer tape detection section and the solenoid drive system, and Figure 6 is the recording/reproducing system according to the present invention. FIG. 3 is a diagram schematically showing a tape loading operation state of the apparatus. DESCRIPTION OF SYMBOLS 1... Magnetic recording/reproducing device, 2... 3/4 inch video tape cassette, 3... Supply side reel disk, 4... Winding side reel disk, 5... Supply side loading arm, 6... Winding Side loading arm, 7... Loading ring, 8... Guide drum, 9... Capstan, 10... Pinch roller, 11... Erase address head, 1
2...Audio control head, 13,
14... Loading pole, 16... Supply side reel motor, 17... Winding side reel motor, 18
...Supply side brake solenoid, 19... Winding side brake solenoid, 20, 21... Brake arm, 22, 23... Brake band, 26...
Magnetic tape, 27A, 27B...tape path, 2
8... Lamp, 29... Supply side phototransistor, 30... Winding side phototransistor, 39...
... Loading motor, 55 ... Pinch roller crimping solenoid, 58 ... Capstan motor,
70... Phase comparator, 71... F-V converter, 72... Mixing amplifier, 73... Motor drive amplifier, 74... Fast forward/rewind mode setting circuit,
77...Motor braking circuit, 78...Control circuit, 7
9, 80, 81... Solenoid drive circuit.

Claims (1)

[Scope of Claims] 1. A device for recording and reproducing by running a magnetic tape along a predetermined tape path, in which the magnetic tape runs along a predetermined tape path and a drum rotates for fast forwarding and winding. A pinch roller pressing means holds the pinch roller pressed against the capstan in all modes including the return mode, and rotates the capstan motor at a predetermined speed corresponding to each mode while the tape is being held and driven. The capstan motor control means switches and controls the tape to run in the same direction and stops the rotation by operating the stop mode. 1. A magnetic recording/reproducing device characterized in that it is configured to be driven and driven by a pinch roller and the capstan. 2. In a device in which a magnetic tape runs along a predetermined tape path to perform recording and reproduction, all modes including fast forward and rewind modes in which the magnetic tape runs along a predetermined tape path and the drum is rotating. A pinch roller crimping means holds the pinch roller crimped to the capstan during the mode, and a pinch roller crimping means controls the rotation of the capstan motor so that the tape runs in a predetermined direction at a speed corresponding to each mode while being pinched and driven. a capstan motor control means that switches and controls the rotation and controls the rotation to be stopped by a stop mode operation; a reel disk braking means for braking the reel disk to stop the reel disk; and a pinch roller crimping means that operates upon detection of a start or end of the tape while the tape is running at high speed to separate the pinch roller from the capstan. 1. A magnetic recording and reproducing device comprising: a pinch roller pressure means control means for setting the pinch roller pressure means in an inoperable state.